<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3//EN">
<HTML><HEAD>
<TITLE>IBM Visualization Data Explorer Programmer&#39;s Reference</TITLE>

<META HTTP-EQUIV="abstract" CONTENT="IBM Visualization Data Explorer
Programmer&#39;s Reference">
<META HTTP-EQUIV="contact" CONTENT="IBM Visualization Data Explorer
(ibmdx@watson.ibm.com)">
<META HTTP-EQUIV="owner" CONTENT="IBM Visualization Data Explorer
(ibmdx@watson.ibm.com)">
<META HTTP-EQUIV="updated" CONTENT="Tue, 16 Sep 1997 ">
<META HTTP-EQUIV="review" CONTENT="Fri, 14 Aug 1998 ">

<META HTTP-EQUIV="keywords" CONTENT="GRAPHICS VISUALIZATION VISUAL PROGRAM DATA
MINING">
<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">
</HEAD><BODY BGCOLOR="#FFFFFF">

<A NAME="Top_Of_Page"></A>
<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
<B>&#91; <A HREF="#Bot_Of_Page">Bottom of Page</A> &#124; <A
HREF="progu199.htm">Previous Page</A> &#124; <A HREF="progu201.htm">Next
Page</A> &#124; <A HREF="../proguide.htm#ToC">Table of Contents</A> &#124; <A
HREF="progu097.htm#PToC20">Partial Table of Contents</A> &#124; <A
HREF="progu344.htm#HDRINDEX_START">Index</A> &#93;</B><HR><P>
<H3><A NAME="HDRDXGSI" HREF="progu097.htm#PToC_294">DXGetScreenInfo</A></H3>
<A NAME="IDX1792"></A>
<A NAME="IDX1793"></A>
<P><STRONG>Function</STRONG>
<P>
Returns information about a Screen Object.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
Screen DXGetScreenInfo(Screen s, Object *o, int *position, int *z)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
Returns the Object being transformed and the screen transformation
parameters from Screen Object <TT><STRONG>s</STRONG></TT>.  If
<TT><STRONG>o</STRONG></TT>
is not <TT><STRONG>NULL</STRONG></TT>, then the Object being transformed
by the screen transformation is returned in
<TT><STRONG>o</STRONG></TT>.  Similarly, if
position is not <TT><STRONG>NULL</STRONG></TT>, then the
type of screen transformation
is returned in <TT><STRONG>position</STRONG></TT>.  Finally, if
<TT><STRONG>z</STRONG></TT>
is not <TT><STRONG>NULL</STRONG></TT>,
the depth of the Screen Object is returned in
<TT><STRONG>z</STRONG></TT>.
<P>
The value returned in <TT><STRONG>position</STRONG></TT> will be one of the
following:
<UL COMPACT>
<LI><TT><STRONG>SCREEN_VIEWPORT</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is
in viewport-relative coordinates.  <TT><STRONG>o</STRONG></TT>
will be centered in the viewport when displayed.
<LI><TT><STRONG>SCREEN_PIXEL</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is in pixel
coordinates.  <TT><STRONG>o</STRONG></TT>
will be centered about the specified pixel
coordinate when displayed.
<LI><TT><STRONG>SCREEN_WORLD</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is in
world coordinates.  <TT><STRONG>o</STRONG></TT> will
be located in the world coordinate system.
<LI><TT><STRONG>SCREEN_STATIONARY</STRONG></TT>--<TT><STRONG>o</STRONG></TT> is
parallel to the screen, but in its own
coordinate system.
</UL>
<P>
When position is <TT><STRONG>SCREEN_STATIONARY</STRONG></TT>, then
<TT><STRONG>z</STRONG></TT> will take one of the following values:
<TABLE CELLPADDING="3">
<TR VALIGN="TOP"><TD><P><TT><STRONG>&lt; 0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed behind the
other
Objects in the scene.
</TD></TR><TR VALIGN="TOP"><TD><P><TT><STRONG>&nbsp;&nbsp;0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed in the middle
of
the scene.
</TD></TR><TR VALIGN="TOP"><TD><P><TT><STRONG>&gt; 0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed in front of
the
other Objects in the scene.
</TD></TR></TABLE>
<P><STRONG>Return Value</STRONG>
<P>
Returns <TT><STRONG>s</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT>
and sets an error code if <TT><STRONG>s</STRONG></TT> is not
a Screen Object.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu260.htm#HDRDXNSN">DXNewScreen</A>,
<A HREF="progu325.htm#HDRDXSSO">DXSetScreenObject</A>
</STRONG></TT>
<P>
<A HREF="progu079.htm#HDRSNCS">16.5 , "Screen Class"</A>.
<P><HR><B>&#91; <A HREF="#Top_Of_Page">Top of Page</A> &#124; <A
HREF="progu199.htm">Previous Page</A> &#124; <A HREF="progu201.htm">Next
Page</A> &#124; <A HREF="../proguide.htm#ToC">Table of Contents</A> &#124; <A
HREF="progu097.htm#PToC20">Partial Table of Contents</A> &#124; <A
HREF="progu344.htm#HDRINDEX_START">Index</A> &#93;</B> <br><b>&#91;<a
href="../allguide.htm">Data Explorer Documentation</a>&nbsp;&#124;&nbsp;<a
href="../qikguide.htm">QuickStart Guide</a>&nbsp;&#124;&nbsp;<a
href="../usrguide.htm">User&#39;s Guide</a>&nbsp;&#124;&nbsp;<a
href="../refguide.htm">User&#39;s Reference</a>&nbsp;&#124;&nbsp;<a
href="../proguide.htm">Programmer&#39;s Reference</a>&nbsp;&#124;&nbsp;<a
href="../insguide.htm">Installation and Configuration
Guide</a>&nbsp;&#93;</b><br><p><b>&#91;<a
href="http://www.research.ibm.com/dx">Data Explorer Home
Page</a>&#93;</b><p><HR ALIGN=LEFT WIDTH=600><b>&#91;<A
HREF="http://www.ibm.com/">IBM Home Page</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Orders/">Order</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Search/">Search</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Assist/">Contact IBM</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Legal/">Legal</A>&nbsp;&#93;</b><hr><p>
<A NAME="Bot_Of_Page"></A>
</BODY></HTML>
